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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5da15a992eb7c8baa4feaba448591f352e8c87abf50d39988224769317574c' 
  AND token = 'cKkAF8fWQ8UVpCM/lNjetrl/rm8LHN4Qb+Nj1PbROjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}